motor lacks power in gear

[hoganrocks]

I have a 67 or 68 evinrude 100 hp it spuders when in gear and just seems to lack power. It did have three gas leaks in carb gaskets from missing bolts. I think I took care of those but havent had a chance to take her back out. Could something other than that be causing the problem?

 

[rickdb1boat]

Re: motor lacks power in gear

Could be it's time to rebuild the Carbs. Could be bad gas. Could be ignition related. Did it run good before? Did you just get the Motor? A little more info will help in the diagnosis. Model # and Serial # also.

 

[hoganrocks]

Re: motor lacks power in gear

dont know the model # I did just get the motor but it was rebult a year ago and ran for about 5 hours and sat the rest of time. i did have to rig a coil wire it seemed to to be making good contact. but dont know for sure.

 

[Hooty]

Re: motor lacks power in gear

After having leaks in the carburetor gaskets, I think you'd be wise to do a compression test. The engine could have sucked air in through the leaking gaskets, causing a lean condition, which can be disastrous.<br /><br />c/6<br /><br />Hooty

 

[hoganrocks]

Re: motor lacks power in gear

I could use some more info on this topic having a hard time finding whats wrong.

 

[ob]

Re: motor lacks power in gear

hoganrocks, As mentioned above it would be a good place to start by performing a compression test on motor to determine that the cylinders and pistons are not damaged due to lean condition.You could either water check after this procedure, since you say you have remedied the leaking carb bases, or simply remove and inspect carbs for restricted low and high speed circuits as well as carb bowl pickup tubes.Will this motor run smoothly on hose?When pumping primer bulb before startup does it get firm?<br /> There are a number of issues that can effect a similar condition as your original post asks.Without seeing motor all help is relied upon the information that you provide in order to assist in troubleshooting problems.<br /> If you are not familiar with some of the procedures necessary in removal, inspection,and testing of components a service manual would be of great assistance in walking you through many of these as well as familiarizing you with some specifics unique to your particular motor.

 

[hoganrocks]

Re: motor lacks power in gear

the primer bulb does get firm when pumping and does run on the hose but does die out when i drop the throtle down to shift speed

 

[ob]

Re: motor lacks power in gear

Bulb getting firm is indication that the carb floats and neddle valves are likely operating fine and not sticking.If this motor was recently holding at idle speed without the fast idle lever raised I would not suspect the idle adjust screw to be the problem.However the fact that it will not hold idle without it being raised is indicative of either idle adjust screw or restriction in idle circuit or pickup tubes.Without removing and inspecting carb components to eliminate posssibility of gummed orifices or jets it's just a guessing game on my part.Restricted fuel porting in carbs is very common problem with motors that are not operated on a regular basis and left with fuel in system.<br /> If you are not familiar with the removing and cleaning and or rebuilding of carbs a manual specific to your motor will be able to walk you through the steps.

 

[Hooty]

Re: motor lacks power in gear

If the engine runs on the hose, idles in the water in neutral but dies when shifting into gear, it could be something as simple as idling to low. The engine should idle at 8-900 rpms in gear, in the water. If you don't know how to idle the engine up, you definently need a repair manual.<br /><br />c/6<br /><br />Hooty

 

[hoganrocks]

Re: motor lacks power in gear

thanks for all the info do you know where i can get a manual for a evinrude starflite 100-s

 

[rickdb1boat]

Re: motor lacks power in gear

You can order generic Manuals at the lower left corner of this page or click Here .

 

[JB]

Re: motor lacks power in gear

Howdy, Hoganrocks.<br /><br />I've been watching, expecting someone to ask if she is running on all four cylinders. Nobody did so I will.<br /><br />First, pull each plug wire and hold it 1/2 to 4/3" from the block and spin her over. You should be able to get a hot, blue spark that far.<br /><br />If you have good spark to all four, get a spray bottle and spray fuel premix (never starting fluid) into each carb while she is sputtering. If she grabs and smooths out for a moment you have a lean mixture problem with that carb.<br /><br />Sputtering is a word often used to describe a 2 stroke that is "four cycling" due to an over rich mixture (too much gas for the amount of air) If this is what is happening, disconnecting the fuel line and hold the throttle. If the engine smooths out after a few seconds she has been four cycling and you need to find which carb is too rich and why.<br /><br />Check those items out and let us know what you find.<br /><br />Good luck.

 

[ebmnajr]

Re: motor lacks power in gear

I have the same problem with a Mercury. Runs great on the hose but will not stay running in gear. I have had it re-ringed it had a broken ring when I bought it. Carbs rebuilt twice. Checked compression O.K. and checked out CDI box. Still no go. Iwas told that it needs rebuilt totally. I thought it might be a timing issue. Any Ideas?

 

[JB]

Re: motor lacks power in gear

Howdy EBMNAJR.<br /><br />Try the tests I suggested to Hoganrocks.<br /><br />If that doesn't nail it for you, start a new thread with your question and the new information.<br /><br />Piggyback questions derail the original thread and confuse readers.<br /><br />Good luck.

 

[Hooty]

Re: motor lacks power in gear

You can go here and get the factory manual.<br /><br /> http://www.kencook.com/ <br /><br />c/6<br /><br />Hooty